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The E89 LCI will likely be a MY 2014 introduced early Mar-May of 2013 with the white halos, updated nav, side turn signals side mirror mounted, & other minor updates.

This is the information I received from the Z4 brand manager out of Munich when I asked about the navigation system in the MY13 I picked up earlier this month...

"The Z4 has the same 609 Nav Professional system as all other BMW models, except of the MY13 7 Series and 3 Series Wagon, that come with an updated system. The Z4 will keep its current system until end of production, so no need to wait. Also there will be no aftersales upgrade offered."